Introduction to 6 ways of CSS equal height layout

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What we said before

Equal-height layout refers to a layout method in which the heights of child elements are equal in the parent element. The implementation of equal height layout includes pseudo equal height and true equal height. Pseudo equal height only appears to be equal height, while true equal height is the real equal height. This article will introduce border simulation, negative margin these two pseudo-heights, as well as table implementation, absolute implementation, flex implementation and jsjudgment of these four true contour layouts

Pseudo-equal height

Border simulation

Because the element border and element height are always the same height, use the element's The border color is used to disguise the background color of the left and right sibling elements. Then use absolute to cover the left and right elements with transparent backgrounds on the left and right borders of the middle element to achieve a visual equal height effect

[Note] The height of the elements on the left and right sides cannot be greater than the height of the middle element, otherwise it will not be supported Open container height

CSS CodeCopy content to clipboard

<style>   
body,p{margin: 0;}   
.parent{   
    position: relative;   
}   
.center{   
    box-sizing:border-box;   
    padding: 0 20px;   
    background-clip: content-box;   
    border-left: 210px solid lightblue;   
    border-right: 310px solid lightgreen;   
}   
.left{   
    position: absolute;   
    top: 0;   
    left: 0;   
    width: 200px;   
}   
.rightright{   
    position: absolute;   
    top: 0;   
    rightright: 0;   
    width: 300px;   
}   
</style>

XML/HTML CodeCopy content to clipboard

<p class="parent" style="background-color: lightgrey;">
    <p class="left">
        <p>left</p>
    </p>
    <p class="center" style="background-color: pink;">
        <p>center</p>
        <p>center</p>
    </p>
    <p class="right">
        <p>right</p>
    </p>
</p>

Negative margin　　

Because the background is displayed in the padding area, set a large value padding-bottom, and then set the same value The negative margin-bottom makes the background color cover the element area and conforms to the calculation formula of the element's box model to achieve a visual equal height effect

[Note] If the page uses anchor to jump, part of the text information will be hidden

[Note] If the background image on the page is positioned at the bottom, it will Can't see background image

##CSS CodeCopy content to clipboard

<style>   
body,p{margin: 0;}   
.parent{   
    overflow: hidden;   
}   
.left,.centerWrap,.rightright{   
    float: left;   
    width: 50%;   
    padding-bottom: 9999px;   
    margin-bottom: -9999px;   
}   
.center{   
    margin: 0 20px;   
}   
.left,.rightright{   
    width: 25%;   
}   
</style>

XML/HTML CodeCopy content to clipboard

<p class="parent" style="background-color: lightgrey;">
    <p class="left" style="background-color: lightblue;">
        <p>left</p>
    </p>
    <p class="centerWrap">
        <p class="center" style="background-color: pink;">
            <p>center</p>
            <p>center</p>
        </p>
    </p>

    <p class="right" style="background-color: lightgreen;">
        <p>right</p>
    </p>
</p>

True equal height

table　

The table-cell element in the table element defaults to equal height

CSS CodeCopy content to clipboard

<style>   
body,p{margin: 0;}   
.parent{   
    display: table;   
    width: 100%;   
    table-layout: fixed;   
}   
.left,.centerWrap,.rightright{   
    display: table-cell;   
}   
.center{   
    margin: 0 20px;   
}   
</style>

XML/HTML CodeCopy content to clipboard

<p class="parent" style="background-color: lightgrey;">
    <p class="left" style="background-color: lightblue;">
        <p>left</p>
    </p>
    <p class="centerWrap">
        <p class="center" style="background-color: pink;">
            <p>center</p>
            <p>center</p>
        </p>
    </p>
    <p class="right" style="background-color: lightgreen;">
        <p>right</p>
    </p>
</p>

absolute　

Set the top:0;bottom:0; of the child elements so that the height of all child elements is the same as the height of the parent element , to achieve the equal height effect

CSS CodeCopy the content to the clipboard

<style>   
body,p{margin: 0;}   
.parent{   
    position: relative;   
    height: 40px;   
}   
.left,.center,.rightright{   
    position: absolute;   
    top: 0;   
    bottombottom: 0;   
}   
.left{   
    left: 0;   
    width: 100px;   
}   
.center{   
    left: 120px;   
    rightright: 120px;   
}   
.rightright{   
    width: 100px;   
    rightright: 0;   
}   
</style>

##XML/HTML Code

Copy content to clipboard

<p class="parent" style="background-color: lightgrey;">
    <p class="left" style="background-color: lightblue;">
        <p>left</p>
    </p>
    <p class="center" style="background-color: pink;">
        <p>center</p>
        <p>center</p>
    </p>
    <p class="right" style="background-color: lightgreen;">
        <p>right</p>
    </p>
</p>

flex　　The telescopic items in flex are stretched by default As the height of the parent element, the equal height effect is also achieved

CSS Code复制内容到剪贴板

<style>   
body,p{margin: 0;}   
.parent{   
    display: flex;   
}   
.left,.center,.rightright{   
    flex: 1;   
}   
.center{   
    margin: 0 20px;   
}   
</style>

XML/HTML Code复制内容到剪贴板

<p class="parent" style="background-color: lightgrey;">
    <p class="left" style="background-color: lightblue;">
        <p>left</p>
    </p>
    <p class="center" style="background-color: pink;">
        <p>center</p>
        <p>center</p>
    </p>
    <p class="right" style="background-color: lightgreen;">
        <p>right</p>
    </p>
</p>

js　　

当子元素高度不同时，进行js判断，增加较低子元素的padding-bottom，使得各个子元素实现等高效果

CSS Code复制内容到剪贴板

<style>   
body,p{margin: 0;}   
.parent{overflow: hidden;}   
.left,.center,.rightright{   
    float: left;   
    width: 25%;   
}       
.center{   
    width: 50%;   
    padding: 0 20px;   
    background-clip: content-box;   
    box-sizing: border-box;   
}   
</style>

XML/HTML Code复制内容到剪贴板

<p class="parent" id="parent" style="background-color: lightgrey;">
    <p class="left" style="background-color: lightblue;">
        <p>left</p>
    </p>
    <p class="center" style="background-color: pink;">
        <p>center</p>
        <p>center</p>
    </p>
    <p class="right" style="background-color: lightgreen;">
        <p>right</p>
    </p>
</p>

JavaScript Code复制内容到剪贴板

<script>   
function getCSS(obj,style){   
    if(window.getComputedStyle){   
        return getComputedStyle(obj)[style];   
    }   
    return obj.currentStyle[style];   
}   
var oParent = document.getElementById(&#39;parent&#39;);   
var oLeft = oParent.getElementsByTagName(&#39;p&#39;)[0];   
var oCenter = oParent.getElementsByTagName(&#39;p&#39;)[1];   
var oRight = oParent.getElementsByTagName(&#39;p&#39;)[2];   
function eqHeight(obj1,obj2){   
    var oDis = obj1.clientHeight - obj2.clientHeight;   
    if(oDis > 0){   
        obj2.style.paddingBottom = parseFloat(getCSS(obj2,&#39;padding-bottom&#39;)) + oDis + &#39;px&#39;;   
    }else{   
        obj1.style.paddingBottom = parseFloat(getCSS(obj1,&#39;padding-bottom&#39;)) +  Math.abs(oDis) + &#39;px&#39;;   
    }   
}   
eqHeight(oLeft,oCenter);   
eqHeight(oLeft,oRight);   
</script>

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